DisplaySize in xorg.conf… uhgg!

Update: This turns out to be done by xrandr which the X.org server hands off to now for dynamic use of monitors. man xrandr even reports that it is trying to keepaconstant DPI. Not sure just why it is doing it, but found a good way to get it done.

I just got a new monitor to be able to use as an external monitor for my laptop. While I was setting it up I noticed that the monitors display size wasn’t correctly detected. The Xorg server does a good job auto-configuring however this caught my eye:

My discovered value and theirs are a couple millimeters off overall so I just used theirs. I created a configuration to define the display size to the the Xorg server. A basic configuration to define display size can be done like this:

Ubuntu uses /usr/share/X11/xorg.conf.d/ Arch Linux and some other use /etc/X11/xorg.conf.d/ (better choice I think). However this won’t work on the external monitor. So I expanded on it (more than it probably needed to be) by defining both monitors and related sections:

I added VendorName and ModelName but I’m not sure they uniquely define the monitor so that the Xorg server acknowledges them. The VendorName I believe is just for reference, ModelName can usually be discovered by doing:

grep "Monitor name" /var/log/Xorg.0.log

Monitor-VGA-0 and Monitor-LVDS define the ports and hence by reference should uniquely define the monitor (xrandr -q shows them and both are found in the Xorg log).

After a bit of research I discovered that there is a good amount of history concerning the Xorg server having a bit of trouble in not being able to correctly discover the display size. I believe this may be related to some drivers. I’ve been told the open-source ATI driver have had problems and read in some other places of other people who have had similar issues. Defining the display size in the configuration and telling the Xorg server not to use the auto-detected value can be done by adding this to the Devices section (for Nvidia drivers use: Option "UseEDID" "FALSE"):

Option "NoDDC"

Unfortunately, this didn’t work either and left me completely at a loss. Unsure how to go further to define display size in the the Xorg server configuration I decided to define it through xrandr.

xrandr has an option to define the display size with the --fbmm option:

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